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研究了掺硅溶胶(SS)对不同搅拌工艺制备的CRTSII型板式无碴轨道用CA砂浆性能的影响。结果表明,掺硅溶胶导致新拌CA砂浆流动性下降,但可有效改善CA砂浆膨胀稳定性,防止泛浆,其原因是由于CA砂浆中水泥水化引起体系离子强度迅速增大而导致硅溶胶凝胶化所致。相同配比条件下,与先在水中加入干粉砂浆制备水泥砂浆,再加入沥青乳液制备CA砂浆相比,采用乳液、水、外加剂预先混合,再加入干粉砂浆制备的CA砂浆易发生泛浆,通过提高硅溶胶掺量和减小沥青乳液用量可制备满足性能要求的CA砂浆。
The effect of silica sol (SS) on the properties of CA mortar for CRTSII plate ballastless track with different mixing process was studied. The results showed that the fluidity of fresh CA mortar decreased with the addition of silica sol, but it could effectively improve the swelling stability of CA mortar and prevent the flooding. The reason is that due to the rapid increase of ionic strength of the cement in CA mortar, the silica sol Caused by gelation. Under the same proportioning conditions, the mortar prepared by adding dry mortar first in water and CA mortar added with asphalt emulsion was prepared by pre-mixing with emulsion, water and admixture and then adding dry mortar to prepare CA mortar, CA mortar can be prepared to meet the performance requirements by increasing the amount of silica sol and reducing the amount of asphalt emulsion.